docs: def aer2ned(az: float, elev: float, slantRange: float,
              deg: bool = True) -> Tuple[float, float, float]:
      """
      converts azimuth, elevation, range to target from observer to North, East, Down
  
      Parameters
      -----------
  
      az : float or numpy.ndarray of float
           azimuth
      elev : float or numpy.ndarray of float
           elevation
      slantRange : float or numpy.ndarray of float
           slant range [meters]
      deg : bool, optional
            degrees input/output  (False: radians in/out)
  
      Results
      -------
      n : float or numpy.ndarray of float
          North NED coordinate (meters)
      e : float or numpy.ndarray of float
          East NED coordinate (meters)
      d : float or numpy.ndarray of float
          Down NED coordinate (meters)
      """
      e, n, u = aer2enu(az, elev, slantRange, deg=deg)
  
      return n, e, -u